Malicious File Detection Using Yara

critical Nessus Plugin ID 91990
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

Nessus detected malicious files on the remote host.

Description

Nessus detected one or more files on the remote Windows host that match a Yara rule.

Note that Nessus has only scanned files with the following extensions:

.application, .asp, .aspx, .bat, .chm, .class, .cmd, .com, .cp, .csh, .csv, .dl, .doc, .docx, .drv, .exe, .gadget, .hta, .inf, .ins, .inx, .isu, .jar, .job, .jpeg, .jpg, .js, .jse, .jse, .jsp, .lnk, .msc, .msi, .msp, .mst, .paf, .pdf, .php, .pif, .ppt, .pptx, .ps1, .ps1xm, .ps2, .ps2xm, .psc1, .psc2, .reg, .rgs, .scf, .scr, .sct, .shb, .shs, .swf, .sys, .txt, .u3p, .vb, .vbe, .vbs, .vbscript, .ws, .wsf, .xls

See Also

http://virustotal.github.io/yara/

Plugin Details

Severity: Critical

ID: 91990

File Name: wmi_malware_yara_filesystem.nbin

Version: 1.121

Type: local

Agent: windows

Family: Windows

Published: 7/11/2016

Updated: 6/9/2021

Dependencies: wmi_malware_scan.nbin

Risk Information

CVSS Score Source: manual

CVSS Score Rationale: The detection is suspected as being malware.

CVSS v2

Risk Factor: Critical

Base Score: 10

Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS v3

Risk Factor: Critical

Base Score: 10

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Vulnerability Information

Required KB Items: malscan/enabled